As Zhou Mengchen expected.

After a while, Master Liu invited the two of them in.

As soon as I entered the lobby, I found that in the lobby, there were not only the county master and Professor Feng, but also Huang Zhubo, and even the county magistrate, and other leading figures in the county government offices.

Zhou Mengchen greeted one of the kings and said, "Go to the county master."

Zhou Mengchen secretly looked at the county master, but he saw that although the county master was wearing official uniforms, he did not have a good temperament. He looked like a thin old man, a goatee beard and a pair of small green bean eyes, and it was unsure. I wonder if it was Zhou Mengchen's illusion, but he only felt that the county master's eyes were always shining, and what shone was either other light or golden light.

There is only money in my eyes.

The county magistrate coughed twice and said, "The people are all here, and Zhou Xunshi has been gone for three years. The Yin-Yang trainer in this county is to control the disasters and dissatisfactions of a county. He teaches the time, and the peace of heaven and the court are important and indispensable. Therefore, it is necessary to use the wise men so that the superiors can live up to the court and the people. It is also the way to maintain peace in the county. Confucius said:------"

Zhou Mengchen lowered his head and listened, but his heart was filled with slander.

If Yin and Yang official is really that important.

It would not have been vacant for three years after my father's death. In fact, if there were any technical problems on the Bell and Drum Tower within these three years, Zhou Mengchen would have solved them in the past. In other words, the entire Jiangxia morning bell and evening drum, night server updates, and other matters were handled by Zhou Mengchen.

However, there is no procedure for attacking the post.

The county magistrate talked endlessly, and finally came to the end. He said: "Now there is a scholar named Wang Daozhi. Zhou Mengchen, the son of the ninth-rank training scholar Zhou Guanxing, is a young talent in the county. However, there is only one position, and the county is in a dilemma, for fear of misleading the country. Today, Professor Feng was invited to comment on the two young talents with this county, which can be regarded as showing the world to the great master and to the public."

"What do you think?"

After a few hundred words, the words made the yin and yang shaking their heads. The officials here naturally would not lose face of the county magistrate and applauded in unison.

The county master slightly twisted the Hu Hu and said to Zhou Mengchen and Wang Daozhi: "Have you two understood it?"

The two looked at each other, stepped forward, bowed and said, "I understand."

The county lord said, "Okay, since that's the case, I won't talk nonsense. The Yin-Yang Calendar Calculation method has always been unfathomable, but today it's just a competition. Even if there is a victory or defeat, don't hurt the harmony, so don't make it so formal. Let's do this. I'll take three questions. Whoever answers the first one will win. What do you think?"

Wang Daozhi and Zhou Mengchen naturally dare not say that they are not.

But Zhou Mengchen suddenly became nervous.

His previous confidence was that mathematics would never lie. It was different from many articles. Even a same article would have different evaluations in the eyes of different people. If there was selfishness in it, there would be too many ways to get rid of a person even though you knew there was a problem, but you could not come up with evidence.

But this kind of competition is not an exam anymore.

Zhou Mengchen was suspicious of Wang Daozhi and had already known the answer. Looking at Wang Daoyi's expression, Zhou Mengchen was even more sure of this.

"I not only have to answer correctly, but also be quick." Zhou Mengchen thought to himself.

The county master said, "In this way, I'll make a question." The county master paused slightly and said, "I have accumulated 136,161 steps now, and ask how far it is?"

Wang Daozhi blurted out at the same time as Zhou Mengchen and said, "Three Hundred and Sixty-Nine Steps."

As soon as he finished speaking, the county master, Wang Daozhi and Master Liu all looked at Zhou Mengchen tightly, especially the county master. His eyes as big as mung beans seemed to suddenly open a lot wider.

Zhou Mengchen took a deep breath and felt his heart beating violently.

In essence, this question is actually squared.

Even the original question in the nine chapters of arithmetic in the Han Dynasty changed some numbers. In today's terms, there is a square piece of land with an area of ​​136,161 steps. So what is its side length? Steps are the units of length in ancient times. When used, they are also used as units of area.

Opening a square square is not difficult for Zhou Mengchen.

The difficulty is to open the mouth square.

At this moment, Zhou Mengchen confirmed that Wang Daozhi knew the answer in advance.

It’s not that Zhou Mengchen underestimated Wang Daozhi, but even modern people may not have such high-speed reaction ability. Not to mention Wang Daozhi. The reason why Zhou Mengchen could answer it was that the number given by the county lord was too small, but it was just a three-digit number. For many science students, some data were not calculated at all, and they were in their brains. They had done it before. Zhou Mengchen also had some speed calculation training. Secondly, Zhou Mengchen was a human being in two lifetimes, and it seemed that the level of development of the entire brain was much higher. Perhaps it could be compared with the genius and academic classmate he had met back then.

Even so, after Zhou Mengchen answered, he quickly calculated it three times in his heart and confirmed that there was no problem. Only then did he have the intention to see the reactions of others.

Wang Daozhi, Master Liu, and County Master are all insiders, so they are incredible. After all, in their opinion, such a question is already very difficult, almost the limit of their thinking imagination. In their opinion, if you give them one or two minutes of an hour, you may not be able to solve it. Not to mention answering it in response.

Huang Zhubo's face showed joy, but then he showed a worried look. This was just a question.

Feng Li looked at Zhou Mengchen with a little more appreciation, and there was a little more doubt in his eyes looking at Wang Daozhi.

Feng Li didn't want to get involved in this matter at first. However, in the secular world, people are always bound to have many ties, and they can't do whatever they want. However, since he has come, he has done his homework in advance. He has inquired about Zhou Mengchen's situation and it can be regarded as the origin of family education. The specific situation is unclear. However, in this era, people with such family education are highly regarded by others, so Zhou Mengchen's oral preface was not very suspicious, and Feng Li did not have much doubts, but only appreciated them.

But he also inquired about Wang Daozhi, but he did not find out what kind of expertise Wang Daozhi had in mathematics.

Is this a sudden enlightenment?

Feng Li was in doubt, but he was a role model, and even if he had doubts, he couldn't easily draw conclusions.

The county magistrate coughed lightly twice, came back from the shock, and said, "Okay, the first question is tied, and then the second question."

"Now there are things that don't know the number, and there are two left in three numbers; there are three numbers left in five numbers; there are two left in seven numbers left in seven numbers. Ask about the size of things?"

With the same result, Wang Daozhi and Zhou Mengchen said in unison: "Twenty-three."

Zhou Mengchen secretly despised Wang Daozhi and did not choose a few difficult questions for cheating. He actually used the original title of "Sunzi Jingjing".

This set of questions is actually a hot topic in ancient mathematics, and it was even developed based on this question. Equations, which are what the ancients called Tianyuan Art. This is also why equations are called binary one-time. Tianyuan refers to unknown numbers in ancient times.

This question is very classic. When interpreted in modern language, there are some items that are not known how many of them are. Just counting them three or three places will leave 2; counting five or five places will leave 3; counting seven or seven places will leave 2. How many of these items are there at least?

Of course, even if this question is not the original question of Sun Tzu's calculation of the scriptures, Zhou Mengchen can solve it, but it may not be answered in an instant.

Wang Daozhi's face became even more gloomy. He asked regardless of the occasion: "Have you read the "Sunzi Jing"?"

Zhou Mengchen smiled slightly and said, "Have you seen it too?"

Zhou Mengchen never took his family's collection seriously, but he didn't know that the early Ming Dynasty was a rare dark era in the history of Chinese mathematics. Even the mathematical level of this period was far inferior to that of the Song and Yuan dynasties. A large number of mathematical classics were lost, and a large number of works by ancestors were questioned by people at that time.

They can't understand it at all.

The king's good fortune is easy to find a difficult problem from where he can easily solve it, but Zhou Mengchen easily solved it, and it was in an instant.

It makes the kingly mind very unbalanced.

The county magistrate snorted coldly, and he was also a little unhappy at this moment.

The county magistrate didn't want Zhou Mengchen to take over the post. After all, he had to do things after collecting money. And these clerks also worked together to create the current scene. If Zhou Mengchen succeeded in the post, these clerks would not know how to be arrogant. That's why they designed this competition method.

The three questions were discussed by Master Liu and Wang Daozhi.

The first question is to increase the amount of calculation. In ancient China, it was not without prescriptions, but it was quite complicated. They had never heard of anyone who could calculate oral or mentally. The second question is a difficult question. How difficult is it? It is so difficult that Master Liu and Wang Daozhi can't do it even if they want to change the numbers in it.

I had no choice but to use the original title. I think the "Sunzi Sutra" has long been lost. Even in the Yongle Ceremony of the Great Nei, the "Que" was written under the Sunzi Sutra. The king's Daozhi was very easy, but I don't know how much effort it took to take a look. I never expected that Zhou Mengchen had read it.

All his efforts were made useless.

The county priest's face looked slightly gloomy and said, "Okay, listen to the third question."

"Now I hope that the pine tree will grow on the mountain, but I don't know the height. I stand up two sides at the same height, two feet tall, fifty steps away from the front and the back, so that the back and the front are in line with each other. From the front, the front is seven steps and four feet, looking at the end of the pine tree from thin to the distance, and combining with the top end. I also look at the top of the pine tree from thin to the surface. I also look at the top of the pine tree from thin to the surface, and combining with the top end. I also look at the top of the pine tree from thin to the surface?"

Wang Daozhi is not a fool, and finally used the most difficult point in Chinese medieval mathematics on the last question, which is the Pythagorean method.
Chapter completed!